The Standalone Model | Trend Micro

Views:

In the standalone model, a computer hosts one Postfix instance acting as the MTA and one IMSS daemon:

Trend Micro recommends deploying Sender Filtering as the first line of defense in your messaging infrastructure. If you choose to enable the Sender Filtering service, the preceding standalone model will change.

Standalone model with Sender Filtering enabled

This setup meets most of the needs of a small to medium-sized company and has low impact on the network since all the processes are running on the same server. Since they are sharing the same resources, however, this configuration requires a powerful server to host Postfix and the IMSS daemon.

The default configuration parameters for both sides are:

In /etc/postfix/main.cf:

 
default_process_limit=200 
imss_timeout=10m 
imss_connect_timeout=1s 
content_filter = imss:localhost:10025 
imss_destination_recipient_limit=200 
imss_destination_concurrency_limit=200

In /etc/postfix/master.cf:

#IMSS: content filter smtp transport imss for IMSS 
imss unix - - n - - smtp 
  -o disable_dns_lookups=yes 
  -o smtp_connect_timeout=$imss_connect_timeout 
  -o smtp_data_done_timeout=$imss_timeout 
  -o smtpd_tls_security_level=none
#IMSS: content filter loop back smtpd 
localhost:10026 inet n - n - 200 smtpd  
  -o content_filter=  
  -o smtpd_timeout=$imss_timeout 
  -o local_recipient_maps= 
  -o myhostname=postfix.imss71 
  -o smtpd_client_restrictions= 
  -o smtpd_enforce_tls=no
  -o smtpd_tls_security_level=none

Note

If you copy and paste the preceding configurations, make sure you correct the indentation of all lines accordingly.